Boulder Measles Case Puts Denver-Boulder Transit Riders on Alert as Colorado Cases Hit 15-Year High
Colorado health officials have confirmed the state's 15th measles case of 2025, marking more infections than all previous years in the past decade combined. The latest case involves a fully vaccinated Boulder resident who potentially exposed hundreds of Coloradans while riding the popular Flatiron Flyer bus service between Denver and Boulder.
The infected individual, who had recently returned from Europe, where according to WHO data measles cases are surging, traveled on the RTD bus line four separate times in early June, potentially exposing Denver metro commuters.
What Colorado Residents Need to Know
While the rising number of cases has raised concerns among Front Range communities, health officials emphasize there is no evidence of sustained transmission within Colorado. Most cases have been travel-related, according to state health department data.
Colorado residents should watch for these initial symptoms:
- Fever
- Cough
- Runny nose
- Red eyes
- Distinctive rash (appearing several days after initial symptoms)
Protecting Your Family
Even vaccinated individuals can contract measles, though they typically experience milder symptoms and are less likely to spread the virus. Unvaccinated Coloradans face the highest risk of infection from what health experts describe as the most contagious human virus known.
"If you believe you've been exposed and develop symptoms, don't go directly to your healthcare provider," advises the Colorado Department of Public Health and Environment. "Call ahead first to prevent potentially exposing others."
Concerned residents can check CDPHE's exposure location list or contact their local public health department for guidance. Front Range families who regularly use public transportation are especially encouraged to stay vigilant and ensure their vaccinations are current.
Community Impact
The case highlights the vulnerability of Colorado's interconnected communities, particularly along the bustling Denver-Boulder corridor where thousands of residents commute daily for work, education, and recreation. Local health officials are working closely with RTD to notify potentially exposed passengers while maintaining regular transit services essential to the region's economy.
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